Clients receiving particularly large volumes of mail may have their own unique postal codes; the same goes for PO Box lobbies of the largest post offices.
Thus the postal code 70-952 means: Similarly, the code for 70-470 denotes the odd numbers from 1 to 27 in the Wojska Polskiego Street in Szczecin, and 34-434 is a code for whole town of Dębno near Nowy Targ (3 – postal district of Kraków, 4 – subdivision of that district, 434 the town of Dębno – strictly speaking the post office in Dębno).
The numbers run clockwise around the map of Poland, from Warsaw (0) in the central east of the country, through east, south, west and north and then back to Łódź (9), close to the geographical centre of Poland.
Each region is operated by one of the Poczta Polska's regional divisions (oddział regionalny), located in the following cities: Codes in the format N0-9NN, e.g. are reserved for bigger clients (e.g. "Telewizja Polska, 00-999 Warszawa"), and internal postal use, (e.g. "60-900 Poznań 2" when addressing post office #2 in Poznań).
Such postal codes route the mail directly to the recipient, therefore a street address is not necessary.